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@article{PORMA_1957__16_1_114781, author = {Keedy, M.L.}, title = {On a theorem of {J\'onsson} and {Tarski}}, journal = {Portugaliae mathematica}, pages = {11--14}, publisher = {mathdoc}, volume = {16}, number = {1}, year = {1957}, mrnumber = {0101200}, zbl = {0090.25002}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1957__16_1_114781/} }
Keedy, M.L. On a theorem of Jónsson and Tarski. Portugaliae mathematica, Tome 16 (1957) no. 1, pp. 11-14. http://geodesic.mathdoc.fr/item/PORMA_1957__16_1_114781/